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1
Content available Analysis of premise infrared heating and ventilation with an exhaust outlet and flat decking air flow
Voznyak Orest, Spodyniuk Nadiia, Savchenko Olena, Dovbush Oleksandr, Kasynets Mariana, Datsko Oleksandra
Diagnostyka
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2022
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Vol. 23, No. 2
art. no. 2022207
EN
The article is devoted to solving of urgent problem to analyse energy saving effect from radiant heating and ventilation of premise with exhaust outlet and flat decking air jet. The aim of the work is analysis of energy efficiency of radiant heating systems using infrared heaters and ventilation of the premise due to the effect of a flat decking air jet on the surface of the heater; determination the amount of heat received both by flat decking air jet from the infrared heater when laying on its flat surface and amount of heat from the exhaust air entering the recuperator. Use of the infrared heaters in combination with an air distribution of the ventilation system with the flat decking air jets is effective, as it allows to achieve savings in heat load of the ventilation system in the range of 11%-19%. The amount of heat recovery of the exhaust air removed by the exhaust outlet is 30-40 W that equals 15%-20%. Saving the heat load of the ventilation system allows reducing the actual initial temperature of the tidal flat decking air jet and achieving a total saving of thermal energy of 24%-34%.
2
Content available Analysis of air jets velocity attenuation at special initial conditions
Voznyak Orest, Spodyniuk Nadiia, Savchenko Olena, Dovbush Oleksandr, Kasynets Mariana, Datsko Oleksandra
Diagnostyka
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2022
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Vol. 23, No. 3
art. no 2022308
EN
The article is devoted to solving the significant problem of efficiency increasing of air distribution in the premise by swirl air jet. The aim of the article is to decrease coefficient of velocity attenuation due to intensification of initial turbulence of different air streams leakage from the air distributor and to obtain of analytical equations for calculation of air distribution in a room to ensure the normative indoor air parameters. Effect of flow twisting results in a reduction of the velocity attenuation coefficient by 2.4 times. The regression analysis testified that the attenuation coefficient of the swirl air jet is more affected by the angle of the twisting plates inclination and less affected by the angle of change of the air flow direction. The attenuation coefficient of all types of rectangular air jets is more influenced by the the ratio of the sides of slit b/l and the angle of change of the air flow direction is also less affected. To minimize the attenuation factor, it is effective to use air distributors at smaller swivel plates inclination angles for swirl air jets and a smaller slit size ratio for all types of rectangular air jets.
3
Content available Enhancing of energetic and economic efficiency of air distribution by swirled-compact air jets
Zhelykh Vasyl, Voznyak Orest, Yurkevych Yuriy, Sukholova Iryna, Dovbush Oleksandr
Production Engineering Archives
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2021
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Vol. 27, Iss. 3
171--175
EN
The article is devoted to solving the urgent task of increasing the efficiency of air distribution by swirled-compact air jets to ensure the normative parameters of indoor air. The dynamic parameters of the swirled-compact air jet during its leakage in the alternating mode and the formation of a dynamic indoor climate in the room are determined. For improvement of comfortable conditions in the room and design of energy saving circuits of air distribution it is suggested to use swirled-compact air jets, which flow from the inflow and exhaust heat recuperators with heat recovery of the exhaust air. An energy audit of the ventilation system reconstruction with a recuperator using was carried out. The method of taking into account the fact of application of several measures, which cannot be carried out simultaneously, and discount rate dynamics is proposed.
4
Content available Diagnosis of damage to the ventilation system
Voznyak Orest, Spodyniuk Nadiia, Sukholova Iryna, Dovbush Oleksandr, Kasynets Mariana, Datsko Oleksandra
Diagnostyka
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2021
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Vol. 22, No. 3
91--99
EN
The article is devoted to solving of urgent problem to eliminate damages of two types in ventilation systems for air distribution efficiency increasing in the premises by swirled air flow, compact air jet, flat air stream and rectangular air jet. A mathematical model of air supply with swirled air flow, compact air jet, flat air jet and rectangular air stream in the room has been developed. It is shown that in order to achieve the maximum efficiency of air distribution it is necessary to ensure its supply by jets. Graphical and analytical dependences on the basis of the conducted experimental research are presented. Parameters of swirled air flow, compact air jet, flat air stream and rectangular air jet during the formation of a comfortable indoor climate are determined. The results of experimental studies of air supply to the room by the air distribution devices, which form a swirled air flow, compact air stream, flat air flow and rectangular air jet with adequate turbulence and long range of the supply air flow, are presented. It is established that with the increase of the angle of swirling plates inclination and ratio of the slit sides the air jets long range increases.
5
Content available The TRIZ method in determining individual heating costs
Adamski Mariusz, Kapalo Peter, Zhelykh Vasyl, Voznyak Orest, Dovbush Oleksandr, Klymenko Hanna, Kozydra Natalia Olcha
Budownictwo o Zoptymalizowanym Potencjale Energetycznym
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2020
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Vol. 9 Nr 1
127--134
EN
The assumptions used in the calculation methods for housing heating costs are described in this paper. The results of calculations are influenced by the values of coefficients related to the location of flats in a building. A technical contradiction, a reversed technical contradiction and a physical contradiction were formulated. Based on the indicated inventive principles, the calculation methods for individual heating costs were analysed.
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